Yes the springs have a little longer front section so you need the shorter hangers. I'm surprised that you got the springs and not the matching hangers as you really need the complete set in order to do the job correctly.
The front hangers are part number AR118. I sell a lot of those hangers to A body guys who are running the circle track springs. Never heard an issue with them so they must be working for people. The circle track springs are a little stiffer than the stock springs so you'll notice the difference in ride. My AR118 hangers have two eye bolt holes so you can adjust the ride height. Be sure to verify the pinion angle as it might need to be adjusted after to change springs and hangers.
